You're absolutely clowning if you think you have the breadth of data available to confidently make such an assessment. This is, ironically, an incredibly Reddit moment.

I wonder how much of that on Reddit is just bots and shills, ie corporations paying to create and upvote posts and comments that support their agenda

It's a more techy community since that tends to be early adopters. They tend to lean pretty heavy left and are more informed. You still have the techys with anime profile pics and are 4chan/incel that are right wing though. They get defederated really quick though.

Whenever I see a political thread here, it seems like the comment section is dominated by the most extreme of the left, with takes like "All right wingers are part of the MAGA crowd and advocating genocide" and "The right wing is weak, stupid, evil, and dangerous so we need to shut it down."

As a centrist (not a rightist,) I don't like this. We need rational discourse, not extremism and hate. Actually talk with reasonable people from outside your political circle please. (Reasonable people, not the right wing extremists that seem to be the only right-wingers y'all hear about.) Remember when we actually had a class struggle that made the people in power nervous instead of identity politics that get the working class fighting each other?

But then, most of the places I talk in are pretty politically left-leaning, so I guess being a centrist does make me look right-wing to a lot of people. I'm rarely seen pushing back against right-wing ideas, but that's because I rarely see right-wing ideas being presented (outside of leftists pointing at rightist ridiculousness) to push back against. That probably has to do with the internet as a whole leaning more left than right.